From Manual espírita by "Bhima" (Francisco I. Madero), 1911.
English translation by C.M. Mayo, from:
...Metaphysical Odyssey Into the Mexican Revolution:
...Francisco I. Madero and His Secret Book, Spiritist Manual
...By C.M. Mayo (Dancing Chiva, 2014)

ANIMATING FORCES

Q. Can you tell me what powers animate our spirit?

A. These powers are enormous. In the first place there are intelligence and will, which, combined with service to higher spirits, can transform the world, as indeed it has been transformed by Buddha, Moses, Christ, and many other great men.
These spirits possess a very clear intelligence which has guided them in fulfilling their mission, and great will, which empowered with the energy to continue on their paths, though these were strewn with a thousand obstacles.

Q. What other powers does the spirit possess?

A. Intelligence and will in greater or lesser degrees may or may not be attributes of incarnate spirits, but in all human personalities there exist in embryo other powers susceptible to great development. These are called mental or psychic powers (from "psyche," soul.)

These powers are not of an exclusively spiritual origin, but neither are they of material origin, and their complex and mixed nature admirably serves to demonstrate that our material body is ruled by a spiritual entity.

Q. How can you prove the existence of these powers?
A. By means of the phenomena they produce: magnetism, hypnotism, suggestion, telepathy, somnabulism, and ecstasy.